This is my desk project. It was put together with Expedit bookshelves from IKEA, a solid core door (which I painted and polyeurythaned), and storage inserts also from IKEA. I think it turned out rather nicely if I do say so myself!
This wall unit is 3 old cheapo laminate book shelves, painted, thin paneling removed and bead board added to the back for support and crown molding added to the top. Seriously...crown molding and paint can turn junk into a jewel.